My email address is pgreen at cfa dot harvard dot edu

Phone is (617)495-7057 and FAX (617)495-7356, at the

Center for Astrophysics,

60 Garden St., Cambridge MA 02138

The image backgound is from
Hubble, showing
a distant cluster of (mostly red) galaxies acting as a gravitational
lens, producing the optical illusion of 4 (blue) images of the same
background quasar.
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